You may find that your original 3D printer cooling fan has malfunctioned, or its blades have broken or been stripped entirely. These fans are necessary to prevent heat creep, which will affect or damage your extruder assembly, and thus your finished prints. Specification: Size: 50mm*50mm*15mm Bearings: Ball bearing Voltage : 12V Current : 0.18A Speed?6500±10%RPM Noise Level?25dBA Connector Type: 2 Pin-ph2.5 Cable Length: 110 CM.